I'm not so sure about this statement. I believe I have read elsewhere on the forums that the only point of the overlap/high idle upon cold start is to kick start the CATs to reduce pollution and meet emissions requirements.
Without this behavior hard coded into the stock ECU flash, the car would start up and have a natural high idle for a period of time, and then slowly drop - much like almost every other car on the road.
I've personally noticed that on super cold starts (around 30 degrees F), the high/overlap idle will do it's thing and then stop, but the idle will still stay high for another minute or two before finally dropping down.
I'm torn on it though myself. Part of me would want to turn it off so my early morning weekday starts aren't so obnoxious and neighbor-waking, but part of me likes how loud and crazy it sounds... because racecar
Quote:
Originally Posted by InvalidJohnny5
I'd leave it as it is...you risk damaging the engine without a proper warming. Just saying.
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